Improved tool-adjuster for lathes



L. J. PARSONS, OF NEW HAVEN, CONNECTICUT,'ASSIG NOR TO HIM` SELF AND C.S. BUSI-INELL, OF SAME PLACE.

Laim Patent No. 89,335, dated mi 27, 1869.

IllPROVED TDOL-ADJ'USTER FOR LATHES. I

The Schedule referred to :ln these Letters Patent and making part of thesama.

To all whom it may conce/m:

Be it known that I, L. J. PARSONS, of New Haven,

in the county of New Haven, and State of Connecticut,

have invented a new improvement in Tool-Adjuster for Lathes; and I dohereby declare the following, when taken in connection with theaccompanying drawings, and the lettels of reference marked thereon, tobe a full, clear,and exact description of the same, and which saiddrawings constitute part of this specification, and represent in- Figure1 a side view;

Figure 2, a front view;

Figure 3, a top view; and in Figure 4, a central section.

This invention relates to an improvement in the ad jnstment of the toolso as to laise or lower the point relatively to the surface being cut,and consists in the arrangement of a plate upon the rest, through whichthe tool-holder passes, and forming in the said plate a` groove,corresponding to the opening through the tool-holder, which said grooveis adapted to receive an adjusting-block, which is dat upon the uppersurface, and the under surface the segment of a circle, the said blocklying in the groove in the plate, and through anA opening in thetool-holder, sothat the under edge of the tool rests in the said block,while the screw through the upper end of the tool-holder bears upon thecutter, to bind it firmly in position, it being adjusted to differentheights of the pointl by setting'the block at different positionsthrough the tool-holder, the said segmental surface inclining to raiseor lower the point in proportion as it isplaced further through theholder or drawn back.

'lo enable others to construct and use my improvement, I will fullydescribe the same, as illustrated in the accompanying drawings.

A is the rest of an ordinary lathe, to which the toolholder B isattached, inthe usual manner, the said tool-holder having an opening,through which to pass the tool O, the said toolbeing held in position bythe screw D.

The usual manner of holding the tool is to place itl directly upon thesurface of the collar E, which surroundsk the tool-holder, and lies uponthe surface of the rest. By this construction, the point of the toolmust be formed to give the proper elevation, or it must be blocked `upto raise the point.

To facilitate the adjusting of thetool to different elevations of thecutting-point, I place beneath the tool a block, F, which passes throughthe tool-holder, formed dat upon its upper surface, to receive the tool,and its under surface a segment of a circle, and I cut a groove in theplate E, to correspond to the segment, or under surface of the block F.

Therefore, to elevate the point of the tool, as in red, iig. 4, forcethe block F further iutothe groove in the collar E, which lowers thefront end, and raises the inner end of the block F, and consequentlyinclines the bearing surface of the tool, so as toraise the point asdenoted in red, or,to lower the point, reverse the operation, asdenotedl in blue, and when in position, turn hard down the screw, tobind the parts together, and securely hold the same in the desiredposition.

By this means the tool may be readily adjusted to any desired elevationof the cutting-point.

I serrate or roughen the under edge of the block F, as seen in fig. 2,in order to give a better hold of the block on its bearing.

I do not broadly claim as my invention the arrangement of a blockbeneath the tool-holder for the purpose of adjustment, as I am aware ofthe patent of A. Hathaway, March 8,. 1864, but in that invention theblock is of diierent form, the clamp or tool-holder passing through theblock, whereas in my invention, the block is not of a spherical form,and passes through', and is retained in position by the tool-holder.

Having fully described my invention,

'What I claim as new and useful, and desire to secure by Letters Patent,is-

The combination with the tool-post B, and slotted ring-collar E, of thesegment of a dat circular plate or disk, located in the mortise, inthetool-post, and serrated on the lower, and curved surface for betteradhesion'to the ring-collar, all constructed and combined in the mannerdescribed.

L. J. PARSONS. Witnesses:

JOHN H. SHUMWAY, A. J. TIBBITs.

